STL is a new satellite-based time and location service for augmenting GPS to combat jamming and spoofing. Its higher power signal opens the possibility to sync indoor synchronization and timing systems without the need for a rooftop antenna system. This content was first presented at several conferences starting in January 2017 including ATIS's Workshop on Time Sync in Financial Markets, "Time & Money" and ION's Precise Time and Time Interval Systems and Applications (PTTI).